/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.aliyun.odps.cupid.table.v1.util;

import java.util.HashMap;
import java.util.Map;
import java.util.ServiceLoader;

public class ProviderRegistry {

    private static Map<String, TableProvider> providerStore = new HashMap<>();

    static {
        ServiceLoader<TableProvider> loader = ServiceLoader.load(TableProvider.class);
        for (TableProvider provider : loader) {
            providerStore.put(provider.getShortName(), provider);
        }
    }

    public static TableProvider lookup(String shortName) throws ClassNotFoundException {
        ServiceLoader<TableProvider> loader =
                ServiceLoader.load(TableProvider.class, ProviderRegistry.class.getClassLoader());
        for (TableProvider provider : loader) {
            providerStore.put(provider.getShortName(), provider);
        }
        TableProvider provider = providerStore.get(shortName);
        if (provider == null) {
            throw new ClassNotFoundException(shortName);
        }
        return provider;
    }
}
